"It was a good series and an outstanding effort from the boys. As a captain I need to keep learning," said Australia skipper Michael Clarke, leading in his first one-day series after being named captain last month.

"Watson is enjoying his batting and also doing the job with the ball."

A disappointed Shakib said: "We batted really well and executed our plans, but we haven't bowled well in three games. It's a learning process and we will learn from it."

Man-of-the-series Watson, who hit a record 15 sixes in his career-best 185 not out in the previous match on Monday, earlier put Australia on course for a big total with a 40-ball 72 which contained three sixes and 11 fours.

Man-of-the-match Hussey was then involved in two useful stands, adding 89 for the fourth wicket with Clarke (47) and 70 for the sixth wicket with Mitchell Johnson, who hammered 41 off just 24 balls.

Hussey fell in the last over, trapped lbw by seamer Shafiul Islam, but not before boosting his team's chances of sweeping the series.

Australia got off to an explosive start after winning the toss as Watson and makeshift opener Ricky Ponting (47) added 110 runs for the opening wicket in just 11.5 overs.

Watson began aggressively, hitting Shafiul for four boundaries in an over early in his innings before pulling left-arm spinner Shakib over mid-wicket for a six to reach his half-century.

The Australian opener, who completed his fifty off just 25 balls with the help of two sixes and nine fours, was bowled in the 12th over while attempting to sweep left-arm spinner Abdur Razzak.

Ponting also played attractive shots during his 50-ball knock, hitting two fours and a six from a Mashrafe Mortaza over. He looked well set before being trapped lbw by Razzak.